Seiko Cal. 5640 - 327

The Seiko 5640-327 represents an important milestone in Seiko's 1981 lineup. Powered by the 5640 caliber with 36j jewels beating at 28,800 bph, it delivers a 62 hours power reserve. [seikata-wm-4e66b8c56de0]

Also known as: Silverwave, Emperor

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

34mm

Case Thickness

8.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Green

Jewels

36j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1981

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